Drawing device for textile fiber preparation



Feb. 25, 1969 G. FUSAROLI 3,429,010

DRAWING DEVICE FOR TEXTILE FIBER PREPARATION Filed Aug. 15, 1965 Sheet, 014

Feb. 25, 1969 G. FUSAROLI 3,429,010

DRAWING DEVICE FOR TEXTILE FIBER PREPARATION Filed Aug. 15. 1965 Sheet 3 of4 5. FUSAROLI 3,429,010 DRAWING DEVICE FOR TEXTILE FIBER PREPARATION Feb. 25, 1969 Sheet 3 014 Filed Aug. 13, 1965 Feb. 25, 1969 3,429,010

DRAWING DEVICE FOR TEXTILE FIBER PREPARATION G. FUSAROIII Sheet Filed Aug. 15. 1965 United States Patent 3,429,010 DRAWING DEVICE FOR TEXTILE FIBER PREPARATION Gotfredo Fusaroli, Via Lancetti 29, Milan, Italy Filed Aug. 13, 1965, Ser. No. 479,504 Claims priority, application Italy, Aug. 19, 1964,

18,001/ 64 U.S. Cl. 19-255 Int. Cl. D0111 5/86 4 Claims ABSTRACT OF THE DISCLOSURE This invention relates to drawing devices for spinning machines and for machines preparatory to spinning, and more particularly to drawing devices in which the material is caused to pass between a pair of aprons or belts each of which is maintained taut between a rotatable roller and a fixed tensor on which it runs with a small radius of curvature.

In these devices, the two aprons are pressed against one another in correspondence with their respective rollers to grip the material therebetween, whereas, in correspondence with the tensor, they are maintained spaced apart a certain distance from one another to guide and accompany the material towards the following pair of drawing rollers, while permitting, the progressive mutual sliding of the fibers which defines the desired thinning of the material.

In the known devices when the pressing roller is integral with the rocking arm, the two tensors are integrally affixed to one another thus forming a U-shaped component. If the tensors are separate members, one is afiixed to a supporting member carried by the swingable arm to which the pressing roller is connected. In order to vary the distance between the two tensors, in the first situation the U-shaped component is replaced, and in the second a shim block is replaced by means of which the supporting member rests upon the lower tensor.

All of the known devices are objectionable in that they require long periods of inactivity for the machine for replacing the tensors or shim blocks for all of the pairs of aprons whenever the yarn to be processed is changed.

An object of this invention is to provide a device for allowing a quick variation of the distance between the tensors, and thus between the two aprons, even during operation of the machine, without releasing the pressure between the pressing roller and the drawing roller thereby eliminating the necessity of having spare parts in storage.

In the present device, at least one of the tensors (or other equivalent means) for holding either apron taut is rotatable about an axis which does not cross the front edge of the tensor and is rigidly connected to a member rotatable about a pin (coincident with said axis, or not), and means are adapted to lock such member and thus the tensor, in any of a plurality of positions angularly spaced apart about the respective pivot and axis.

Further objects and advantages of the invention will become more readily apparent to persons skilled in the art from the following detailed description and annexed drawings and in which drawings:

FIGURE 1 is a side view of a device in which the pressure roller and the drawing roller are fastened to a single supporting member.

FIGURE la is a front elevational view of the device illustrated in FIG. 1.

FIGURE 2 is a side view of a device in which the pressing roller is fastened to a swingable arm.

FIGURES .3 and 4 are views taken along lines xx and yy, of FIGURES 1 and 2 respectively.

FIGURE 5 is a fragmentary enlarged view of the front portion of the device shown in FIG. 1.

FIGURE 6 is a side view of a device in which the upper tensor is affixed to one end of a lever pivoted at its other end to the upper side.

FIGURE 7 is a fragmentary view of a device in which the side carrying the upper tensor can be deformed by the action of a cam, and

FIGURE 8 is a side view of a device in which the distance between the two tensors can be varied by manipulating a lever fulcrumed to the side of the upper tensor and abutting with either end the structure of the lower tensor.

FIGURES 1 and 3 shows the device in the case in which a single supporting member consisting of sides 4-4, suitably connected together supports tensors 3 and 5 about which aprons or belts 2 and 14 are respectively trained. The apron 2 is trained about a drawing roller 1, and the apron 14 about a pressing roller 7 held by the sides 4 and 4'. An arm 8 is pressed on the roller 7 by springs or weight in a known manner.

While the tensor 3 is afiixed to the sides 4 and 4', the tensor bar 5 together with a lever 11 integral therewith is fulcrumed to the sides 4 and 4' as indicated at P. More specifically, the fulcrum P (FIGURES la and 5) is constituted by a pin P projecting outwardly from each side in proximity to the end of the slot in the side wall which receives the tensor bar 5 and a recess P" in the lever 11 in which the pin P is positioned. The lever 11 enables the tensor 5 to be rotated about the fulcrum P and the tensor 5 can be set in any desired angular position by inserting the free end of the lever 11 in one of the notches of a toothed segment 12 integral with the side 4. A similar arrangement can also be provided for the side 4'.

The net distance d, between the tensor bars 3 and 5, which defines the gap between the aprons 2 and 14 is thus a function of the position of the lever 11. As best seen in FIG. 5, the distance d can become the distance d by shifting the lever indicated by the dotdash lines 11 to the position 11. This adjustment can be quickly and conveniently performed even with the machine in operation. This is particularly efficacious in that it is possible to immediately check from the material coming from one apron pair which is the optimum gap d thus conforming to such setting the levers 11 for all of the drawing sets of the machine.

FIGURES 2 and 4 illustrate a modification of the device in which the pressing roller 7 is affixed to a swingable arm 9 so as to be displaced therewith as indicated by the dot-dash lines in FIG. 2. The tensor 5 is carried by an element 6 suitably attached to the shaft of the roller 7 so that the apron 14 also moves with the displacement of the arm 9.

When the arm 9 is lowered, the roller 7 bears on the drawing roller 1 via the aprons 1-4 and while the element 6 rests upon the tensor 3 through a fixed projection 10. In this embodiment, the tensor 5 is pivoted at P to the two sides of the component 6 and can be displaced by rotation of the lever 11 which can be held in different positions by locating the end of the lever in the desired notch in the toothed segment 12 as previously described.

FIGURE 6 shows a further manner for displacing the tensor 5. The tensor is aifixed to one end of a lever 17 which is pivoted at P at its other end to a side 18 similar to the side 4 in FIG. 1 or a component 6 as in FIG. 2. The lever 17 can be locked in one of a plurality of different angular positions by locating the lever between the dowels or teeth 13 projecting from the side 18 side.

The movement of the tensor 5, in FIG. 6, is not rotation about an axis passing therethrough, but rotation about the pivot point P located outside of the tensor and this axis under certain conditions can also be the axis of the pressing roller 7.

In the embodiment shown in FIG. 7, each side 18 is resiliently deformable by the provision of a slot 19 and the deformation thereof is caused by the cam 20 coacting with a wall of the slot. This permits the distance d to be varied as shown in the drawing, with the dot-dash line indicating one of the different positions of the tensor 5 and of the apron 14 Wound therearoundl.

FIGURE 8 illustrates further a modification in which the tensor 5 is affixed to the component 6 with the projection 10, by which the component 6 rests on the tensor 3 being pivoted at P and eccentric with respect to P. The projection is integral with the lever 11 which can be held in different positions to vary the net distance d between the tensors 3 and 5 as hereinabove described in connection with FIG. 1.

I claim:

1. A drawing device for textile fiber preparation comprising a supporting frame, a first tensor having front and rear edges and a first rotatable roller supporting said supporting frame, a first endless apron trained about said tensor and roller, a second tensor having front and rear edges and a second rotatable roller associated with said supporting frame in spaced relation to said first tensor and roller, a second endless apron trained about said second tensor and roller with the fiber being prepared passing between said first and second aprons, a lever rigidly connected at one end with one of said tensors, means pivotally connecting said lever and one tensor to said supporting frame for rotation about an axis which does not pass through the front edge of said one tensor, and means on said supporting frame defining a plurality of angularly spaced apart projections, said lever being selectively movable into the space between projections for locking said lever and one tensor in position relative to the other tensor for changing the distance between said first and second aprons.

2. The drawing device as claimed in claim 1 in which said one tensor is of noncylindrical cross section with its longitudinal midplane being inclined to the direction of movement of the lower flight of the apron trained about said one tensor and roller.

3. The drawing frame as claimed in claim 2 in which said means defining a plurality of angularly spaced projections includes a toothed segment.

4. The drawing device as claimed in claim 1 in which the means pivotally connecting said lever and one tensor to said supporting frame is located at the opposite end of said lever and said means defining the plurality of angularly spaced apart projections is located in proximity to the rigid connection between said lever and one tensor.

References Cited UNITED STATES PATENTS 3,235,914 2/ 1966 Beppu 19--254 3,243,854 4/1966 Beppu 19255 1,092,631 4/ 1914 C-asablancas 19-249 2,675,585 4/1954- Naegeli 19-256 X FOREIGN PATENTS 949,995 9/ 6 Germany.

718,926 11/ 1954 Great Britain.

745,127 2/ 1956 Great Britain.

MERVIN STEIN, Primary Examiner.

D. NEWTON, Assistant Examiner. 

